Caldwell Pink
This excellent polyantha has very small, very double lavender  pink blooms.   The plant is vigorous to about 4' tall and wide and blooms in big flushes throughout the season.  It is an airy plant with narrow stems. It is rated as hardy from zone 6 but I have heard of people growing it successfully further north than that.  It gets little blackspot. On the whole it is pretty healthy and tough .  Bred in 1928.